I set the time for a push notification to be sent, but the notification is not sent at the designated time.

When the time you set is 1-20 minutes after the time you sent the push notification by using the “Send notification” function, the notification may not be sent at the designated time as it takes time for the push notification setting to be saved and become active.

Kindly make sure to set the time at at least 20 minutes after the time you send the push notification by using the “Send notification” function.